| Wavenumber (cm−1) | Assignment |
| 3420 | O-H stretching |
| 2970, 2930, 2860 | C-H stretching (CH3as), C-H stretching (CH2as), C-H stretching (CH2s) |
| 1750 | C=O stretching |
| 1622 | C=C stretching (aromatic) |
| 1450, 705, 880 | Carbonates |
| 1450 | Asymmetric deformation of the C-H bond of -CH3 and -CH2 |
| 1045 - 1150 | C-O stretching |
| 1085 | Vibration of Si-O-Al in clays |
| 691, 795, 780 | Quartz |
| 460, 520 | AlO6 and SiO4 in clays |
| 350 - 425 | Pyrite |